a louisiana police officer studying water currents at a known sink hole. right in front of him, this happens. these trees are swallowed up. last summer, the sink hole swallowed 24 acres of land. it is caused by a giant salt cavern underwater. >> we are used to seeing sink holes in the street. there is a big gaping hole in the road. >> it was plugged up back in 2011. it has caused all sorts of problems for many years now with evacuations and now obviously, there is going to be some major lawsuits coming in that particular area. that is why the camera was set up there. but boy, was that amazing? how about another amazing view? overcast skies. air temperature has been dropping like a rock. currently it is 60 in oakland. 60 in san francisco. low 60s in san jose. today numbers stacked up like this. from 62 in pacifica. livermore. about 10 degrees below normal. it was only 78 degrees in santa rosa. tonight. it is refreshing, you have the windows open. the clouds rolling in. 50s and 60s overnight lows. future cast clearly illustrating, we have a really robust mar